"United States World War I Draft Registration Cards, 1917-1918," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:KZDT-SLR : 13 March 2018), Ellis Hagar Nickell, 1917-1918; citing Stephens County, Oklahoma, United States, NARA microfilm publication M1509 (Washington D.C.: National Archives and Records Administration, n.d.); FHL microfilm 1,852,128.
"Oklahoma, County Marriages, 1890-1995." Database with images. FamilySearch. "Oklahoma, County Marriages, 1890-1995," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVP6-XBMV : 5 November 2017), Ellis Hagar Nickell and Ora Elaine Hinchey, 05 Apr 1919; citing Oklahoma, various county courthouses, Oklahoma; FHL microfilm.
"United States Census, 1920," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MJMZ-37V : accessed 1 July 2019), H E Nickell, Marlow, Stephens, Oklahoma, United States; citing ED 258, sheet 2A, line 25, family 33, NARA microfilm publication T625 (Washington D.C.: National Archives and Records Administration, 1992), roll 1484; FHL microfilm 1,821,484.
"United States Census, 1930," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:XCWQ-C5N : accessed 30 June 2019), Ellis H Nickell, Chandler, Lincoln, Oklahoma, United States; citing enumeration district (ED) ED 4, sheet 8B, line 64, family 219, NARA microfilm publication T626 (Washington D.C.: National Archives and Records Administration, 2002), roll 1911; FHL microfilm 2,341,645.
"Oklahoma, School Records, 1895-1936," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:Q2TF-QWM9 : 10 April 2018), E H Nickell in entry for Ellis H Nickell, 1932; citing School enrollment, Chandler, Lincoln, Oklahoma, United States, multiple County Clerk offices, Oklahoma school district offices, Oklahoma; FHL microfilm 2,449,691.
"United States Census, 1940," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:VBVJ-SW8 : 13 March 2018), E H Nickell, Chandler, Chandler City, Lincoln, Oklahoma, United States; citing enumeration district (ED) 41-5, sheet 5B, line 79, family 121, Sixteenth Census of the United States, 1940, NARA digital publication T627. Records of the Bureau of the Census, 1790 - 2007, RG 29. Washington, D.C.: National Archives and Records Administration, 2012, roll 3306.
"United States, GenealogyBank Obituaries, 1980-2014," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QKWP-Y5KD : accessed 1 July 2019), Ellis Hager in entry for Frank Nickell, Oklahoma City, Oklahoma, United States, 12 Aug 2004; from "Recent Newspaper Obituaries (1977 - Today)," database, GenealogyBank.com (http://www.genealogybank.com : 2014); citing Daily Oklahoman, The, born-digital text.
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